3.4 Motor and drive train

Motor type:                         Chevrolet 270 gasoline

Cooling system:                 water

Cylinders:                           6 in line  with top valves

Bore:                                   96 mm

Stroke:                                102 mm

Cylinder capacity:              4,416 liter

Compression ratio:           6,75:1

Capacity:                            91,5 pk (67 kW) at 2750 tpm

Maximum torque:               28,85 Nm at 1400 tpm

Figure 1. Back and left side of the GMC CCKW 'Chevrolet 270' gasoline engine

Figure 2. As it should look like coming out of the factory (courtesy Chris Balkenende)

Due to its considerable fuel consumption (35 liters per 100 km), many post-war civilian GMC users converted their trucks to LPG or diesel. Wellknown European suppliers of diesels were Perkins, Ford, Henschel and Deutz. Paul Hazen compiled the list below showing all the firms providing diesel engines for GMC´s.

* The Henschel 511 was based on the original GMC body of which the head had been replaced by a stronger one. The fuel injection
followed the Lanova principle.

** The Ford 6D had been built from 1952 until 1965.

*** The OM had 4 cylinders whereas all others had 6.

****in any case types 6.305, 6.288 and 6.354.

Right below a few examples of Dutch firms offering to convert the 'Chevrolet 270' to diesel or liquid gas:

Henschel (courtesy of Ad Gevers)
        

Perkins:
   

Algas (courtesy of Peter Albers)

Having your original engine replaced is good for your wallet, but you are bound to loose that marvelous
sound of the 'Chevrolet 270' then (by courtesy of Johan Edelhausen).

Clutch:                                              Mechanically operated single dry plate type

Gearbox transfer ratios:                     1^st            6.06 : 1

                                                              2^nd           3.50 : 1

                                                              3^rd            1.80 : 1

                                                              4^th            1 : 1

                                                              5^th             0.79 : 1

                                                              reverse     6.00 : 1

                                                              transfer case high gearing 1.155 : 1

                                                              transfer case low gearing 2.602 : 1

Drive via shafts from the tranfer case with either 6x4 (high or low gearing) or 6x6 (low gearing only)

Figure 3. Position of drive shafts and (cardanic) joints on frames with 'split axles' (top) and 'banjo axles' (bottom)

Brake system: non-separated, hydraulic, motor vacuum assisted (‘Hydrovac’) brake drums on all six wheels

Tires:                7.50 x 20 with ply rating 8, usually with ‘non-directional’ profile (Figure 3)

Figure 4. Typical GMC tire

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webmaster: J. Schröder

Gelanceerd / first launched: 7 January 2005

Laatst herzien / last revised: 14 January 2010